 <div class="row"  >
    <div class="col-md-4" style="margin:0 auto; float: none" >
      <div class="panel panel-default">
        <div class="panel-heading">登录 <a style="color:red;" >{{.err}}</a></div>
        <div class="panel-body">
          {{template "components/flash_error.tpl" .}}
          <form action="/center" method="post">
            <div class="form-group">
              <label for="username">用户名</label>
              <input type="text" id="username" name="username" class="form-control" placeholder="用户名">
            </div>
            <div class="form-group">
              <label for="password">密码</label>
              <input type="password" id="password" name="password" class="form-control" placeholder="密码">
            </div>
            <input type="submit" class="btn btn-default" value="登录">
          </form>
        </div>
      </div>
    </div>
  </div>
